The "Micropro Touch Key" immobiliser is a high security automatic arming anti-theft system. During arm state, the system immobilise the vehicle through interrupting the power supply to 2 areas essential for starting up of vehicle (ie. starter, ignition system or fuel supply). Disarming the system is by using a technological advance electronic digital touch key. Each key is uniquely coded. The large number of code combinations, 1014, is a deterrence to code scanning. The requirement for the direct contact of touch key to its panel mount probe make code grabbing impossible. The touch key is made of stainless steel case, it is handy, small and durable. The tri-colour LED and buzzer provide indication of the state of the system. The circuit of the system is designed such that disconnection of its power supply will not allow the vehicle to be started.